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Why is it necessary to have a system of classification for living things? It makes it easier to study them because we can use general descriptions to understand characteristics of organisms in the same group
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Chapter 28 Mid-term Review
Classification and Arthropods
List the 7 Taxa in descending order
• Kingdom• Phylum• Class• Order• Family • Genus• Species
Why is it necessary to have a system of classification for living
things?
• It makes it easier to study them because we can use general descriptions to understand characteristics of organisms in the same group
List as many general characteristics of arthropods as you can recall.
• Chitinous exoskeleton• Segmented bodies• Jointed appendages• Open circulatory systems• Ventral nerve cord• Well-developed senses
List the 4 Classes of Arthropods
• Arachnida• Crustacea• Myriapods• Insecta
General Description of Arachnids
• 2 main body segments – cephalothorax and abdomen
• Lack antennae, have pedipalps• Lack mandibles, have chelicerae• Use book lungs to breathe• Includes spiders and scorpions
General Description of Crustaceans
• 2 main body segments• Exoskeletons contain calcium carbonate and
chitin• Usually aquatic; breathe using gills• 2 pairs of antenna• Includes crayfish, crabs, and shrimp
General Description of Myriapods
• Have lots of segments• Use tracheal tubes to breathe• Includes centipedes and millipedes
General Description of Insects
• 3 Main body segments – head, thorax, and abdomen
• One pair of antenna• Breathe with tracheal tubes• Very diverse; includes ants, flies, and beetles
What are the two types of metamorphosis?
• Complete and incomplete
List the 3 stages of incomplete metamorphosis
• Egg• Nymph• Adult
List the 4 stages of complete metamorphosis
• Egg• Larvae• Pupa• Adult
Vocabulary
• Molting • Simple eye• Compound eye• Antenna• Pedipalps• Book lungs• Tracheal tubes
Vocabulary• Molting – replaces the old exoskeleton • Simple eye – eye with only one lens• Compound eye – eye with many lenses• Antenna – sensory structure responsible for
touch, taste, smell, and hearing• Pedipalps – arachnid appendage that’s like an
antenna and also holds food• Book lungs – respiratory structure of arachnids• Tracheal tubes – respiratory structure of insects